Smoke-consuming furnace.



Patented Sept. 25, I900.

J. A. CRAWFORD.

SMOKE CUNSUMING FURNAOE.

2 Sheets$heet l.

(No Model.)

(Application filed Nov. 4,1899.)

GI-IIII I/ 1.

| u H z /Z Y3 E WITNESSES No. 658,703. Pa tented Sept. 25, moo;

J. A. CRAWFORD.

SMOKE CONSUMING FURNACE.

(Application filed Nov. 4, 1899.\

2 Sheets-$heet 2.-'

(No Model.)

3440M Foo m: Norms wnzns cu. PNOYO-LITHQ. wAsumumM o c UNITED TATESPATENT OFFICE.

JOHN A. ORAVVFORD, OF ALLEGHENY, PENNSYLVANIA,

SMOKE-CONSUMING FURNACE.

SPECIFICATION forming part of Letters Patent No. 658,703, datedSeptember 25, 1900,

Application filed November 4, 1899. Serial No. 735,786. (No model.)

To all whom it may concern.-

. Be it known that I, JOHN A. CRAWFORD, a citizen of the United States,residing at Allegheny, in the county of Allegheny and State ofPennsylvania, have invented certain new and useful Improvements inSmoke-Consuming Furnaces; and I do hereby declare the following to beafull, clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention has relation to smoke-consuming furnaces; and the objectsare, first, to provide a smoke-consuming furnace which is simplified inconstruction, efficient in operation, and durable in use; second, toprovide such a furnace which presents an improved preservativeconstruction, whereby the respective elements are prevented from beingdestroyed by the caloric effects of the burning gases and flames, and,third, to provide improved means for regulating the drafts to theair-pipes opening from the ash-pit.

With these purposes or objects in view my invention consists in thenovel construction of parts and their combination, as will here-'inafter be fully described, and particularly and distinctly pointed outin the claims.

I have fully and clearly illustrated myimprovements in the accompanyingdrawings, wherein Figure 1 is a vertical section longitudinally throughthe furnace and inner face of one of the side walls thereof, showingair-intake fiues leading from the ash-pit, the gas-fines leading fromthe fire-chamber, and the air and gas pipes opening above into thefirechamber, also showing the air-intake and gas and air discharge pipe.Fig. 2 is a vertical transverse section through the side Wall, showingthe gas channel or chamber, the figure being taken on the line 2 2 ofFig. 1. Fig. 3 is a vertical transverse section taken centrally throughthe draft-box and vertical flue, as indicated by the line 3 3 of Fig. 1.Fig. 4 is a horizontal section on the line 4 4 of Fig. 1. Fig. 5 is adetail central longitudinal section through one of the draftboxes,showing the rod-to operate the draft slides or damper. Fig. 6 is asimilar view to Fig. 5, taken at cross-section thereto.

Referring to the drawings, A A designate the side walls of the furnace;B, the front wall; 0, the grate-bars, and D the bridge-wall.

In the side walls of the furnace leading from the ash-pit E into theside walls are formed air-fines 7, leading into the walls at rightangles and then vertically in the walls, as shown in Fig. 3 at 8 andindicated in dotted lines in Fig. 1, and opening at their upper openends into a horizontal gas chan nel or chamber 9, extendinglongitudinally in the walls on a plane above the grate-bars, as shown,and leading into this gas channel or chamber are a plurality of oblongnarrow fines 10, opening from the fire-chamber into the gaschannel 9. asshown in the drawings.

In the longitudinal portions of the air-intake fiues 7 are arranged andfitted metal boxes F, the bodies of which are of a contour to slide intoand fit the front portion of the fines and about their outer edges areformed with grooved flanges 11, in which is slidingly fitted aplate-damper 12, arranged to close the opening 13, leading into theboxes or sleeves F. The opening 13 is preferably smaller in area thanthe area of the flues and bodies of the boxes. The fines 7 are arrangedintermediate of the flues l0 inorder that the draft from fiues 7 willintersect the gas-channel remote from the fiues 10. and the upper gasand air pipes, when the latter are used, will be remote or a sufficientdistance to remove them from the direct action of the hot flames andgases when the air and gas pipes or fines are used or brought intorequisition.

It will be perceived that, so far as the invention has been described, acomplete and efiective combustion and smoke consumer is afforded. Theair being taken from the ashpit and delivered to the fire-chamberpromotes combustion in the latter to efiectually eliminate the smoke byenhanced caloric effects.

Suitably seated in the walls, with their lower ends opening into thegas-channel and registering with the vertical portions or branches ofthe flue 7, are air and gas pipes G, extending vertically, as shown indotted lines, and formed with downwardly-inclined ends g, openingthrough the face of the wall into the fire-chamber above the gas-channelfines. When these gas and air pipes are used, the operation is asfollows: The air from the ash-pit is taken up through the air-intakefines therein and is carried up into the air and gas tines. At the sametime a side draft is created from the fire-chamberthrough the fines intothe gas-channel, the gases being'led in the channel into the gas and airpipes into the fire-chamber to promote combustion and consume the smoke.

In the bridge-wall is formed a gas-channel 14, which at the ends is incommunication with the gas-channels in the side walls, and

leading into this gas-channel 14 are fiues 15, opening from thetire-chamber, and opening from the ash-pit are air-fines 16, whichintersect the bridge-wall gas-channel by means of vertical branches 16,as shown in the drawings. At the upper end of these air-fines in thebridge-wall over the gas-channels are placed gas and air pipes 17,similar in construction to the pipes in the side walls, and seated withtheir bases substantially on a line with the gas-channels and theirinclined u pperends directed forward and opening into the fire-chamberat the front of the bridgewall, the object being to provide additionalmeans for promoting combustion in the firechamber. The entrance or flowof air into the fines in the bridge-wall is regulated by means identicalto those used for regulating the draftin the fines and pipes in the sidewalls.

It will be perceived that in the construction and arrangement. of theelements of my improvement or invention I have provided a device whichmay be efiectively used without or with steam jets to promote the draftand delivery of the gases and air to the fire-chain her. If steam-jetsare desired, they can be readily and conveniently applied in any mannerwithin the skill of the mechanic.

What I claim is- 1. In a s|n0l e-consuming furnace the combination ofthe side walls formed with longitudinal gas-chan nels l cated above thegratebars, gas-fines leading, from the fire-chamber and intersecting thegas-channels, and air- .flnes opening from the ash-pit and intersectingthe gas-channels intermediate of the gasflnes, air and gas pipes placedabove the gaschannels and opening at their base into the gas-channelsand registering with the upper ends of the air-fines, and formed withdownwardly-inclined branches opening into the fire-chamber, metal boxesin the months of the air-fines in the ash-pit, and slides to adjustablyclose the mouths of the metal boxes, substantially as described.

2. The combination with the side walls formed with longitudinalgas-channels and gas-fines opening therein from the fire-chamber, of thebridge-wall formed with a gaschannel communicating at its ends with thegas-channels in the side walls, gas-fines in the bridge-wall openingfrom the fire-chamber and intersecting the gas-channel, air-tinesopening into the bridge-wall from the ash-pit and interseotingthegas-channel in the bridgewall, air and gas pipes in the bridge-wallhaving their bases opening into the gas-channel therein and formed Wit-hdown wardly-inclined and forwardly-directed ends opening intothefire-chamber, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN A. CRAWFORD.

Witnesses:

CLARENCE GoBIN HEYLMUN, E. H. BATES.

